APT E / Est. Index 300ml

With the 2HR Aquarist APT-EI, the famous nutrient dosing approach pioneered by Tom Barr is now available in a ready-to-use concentrate that removes the guesswork from trying to recreate this powerful and sometimes elusive formula.

APT e / ESTIMATIVE INDEX provides an easy approach to practice Tom Barr's famous fertilisation regime, with adjustments based on our proprietary Capstone Formula. Use it for the quintessential EI experience of peerless growth speed through unlimited nutrition- but make sure that you are equally disciplined in plant husbandry and maintenance.

Dose 2ml per 100L daily.